Wonderful vids you found Torch, that Yak is really something else altogether - its builder is as much an artist as an stickler for anally retentive detail;I wonder if he was developing (for himself or a model maker) it with an idea to selling it as a kit?
Love the real radial engines 47's, even though they sounded like they were doing 3 to 4 more revs than scale, but with 5 cylinders and 400cc, the similar scaled engine to a real 47 would've been almost double the displacement.
Now, al we need a re RC motorbikes with IC engines... (instead of Kyosho's electric ones)..